Malicious PDF — malware analysis report

Static analysis result for SHA-256 6235b508e2fa4165…

MALICIOUS

PDF

78.1 KB Created: 2021-07-15 16:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0093b25988f3100b9141c9dfa6f7af4 SHA-1: 37d9451a461338015f6d28079027ab32f1799c4c SHA-256: 6235b508e2fa41654c9efb95f276578d0953885b4d569721cb9d6d9dac8bef7a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7832

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608109cb9b998---tabozozujiwisixu.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd6f7ad588---48537418478.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/zavoduredupunovupuwaran.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4fe721a47d3c324dbfc4cb44059881a9/baseterasuzarujo.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5b663f333---57646639233.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/61728480781.pdfIn PDF document text
    • http://roocenter.ru/upload/file/80103213204.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/dujakosazekotatenonenunav.pdfIn PDF document text
    • http://tcihk.com/userfiles/poxoseni.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/55352031383.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/78919581347.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/wurukujivukim.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/gekemozolejifatupoze.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e45ca3fcb2---rawabanifedudomitaxugozat.pdfIn PDF document text
    • http://kleiberit.ru/files/file/58416397773.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/nofogediwo.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ok3gg72o1087stf3rjbsv0nqg2/96637689610.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16078089bbf859---15170748022.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/lqueur1a48hmg80a047h5f2guu/nasufebub.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2ffc966b0d58eb06fdd147b63ba6868d/66791861658.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/858d6d24c658de899fa6e674f91fbf13/74909011762.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9cb94623---vabexewulapobegemowakad.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/1719036037.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe4eec5a7f---25834746560.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37c5caebd15f91a4543cba5327bf5901/65444512853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=crossing+fingers+meaningPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010944.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10944 17560 bytes
SHA-256: 0e6ba50d0c36d1c2aa334fcc245970c09424ecae30f8bbf32d9e4169d1d007c4
font_00_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 10444 bytes
SHA-256: 0fe6fac83232f124de7346cd82bdd47e06813f854d90e83d75c29645167e2d31
font_02_sfnt_off00012455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12455 4216 bytes
SHA-256: 7bf1c6716eca430e19cdbf12568b57571847c250a545703ba1dfcbe7fc97b1a2